Exam (elaborations)
Chapter Fourteen SEMICONDUCTOR ELECTRONICS MATERIALS, DEVICES AND SIMPLE CIRCUITS
Chapter Fourteen SEMICONDUCTOR ELECTRONICS MATERIALS, DEVICES AND SIMPLE CIRCUITS
[Show more]
Content preview
Chapter FourteenSEMICONDUCTOR
ELECTRONICS
MATERIALS, DEVICES
AND SIMPLE CIRCUITS
MCQ I
14.1 The conductivity of a semiconductor increases with increase in
temperature because
(a) number density of free current carriers increases.
(b) relaxation time increases.
(c) both number density of carriers and relaxation time increase.
(d) number density of current carriers increases, relaxation time
decreases but effect of decrease in relaxation time is much less
than increase in number density. 1
2
14.2 In Fig. 14.1, Vo is the potential barrier across a p-n 3
junction, when no battery is connected across the junction
V0
(a) 1 and 3 both correspond to forward bias of junction
(b) 3 corresponds to forward bias of junction and 1
corresponds to reverse bias of junction
(c) 1 corresponds to forward bias and 3 corresponds to reverse
bias of junction. Fig. 14.1
21/04/2018
, Exemplar Problems–Physics
(d) 3 and 1 both correspond to reverse bias of junction.
14.3 In Fig. 14.2, assuming the diodes to be ideal,
(a) D1 is forward biased and D2 is reverse biased and hence current
flows from A to B
(b) D2 is forward biased and D1 is reverse biased and hence no
current flows from B to A and vice versa.
(c) D1and D2 are both R D1
A
forward biased –10V
and hence
current flows
from A to B. D2
(d) D 1 and D 2 are
both reverse Fig. 14.2 B
biased and hence
no current flows
from A to B and vice versa.
14.4 A 220 V A.C. supply is connected between points A and B
(Fig. 14.3). What will be the potential difference V across the
capacitor?
(a) 220V.
A (b) 110V.
(c) 0V.
220V C V
A.c. (d) 220 2 V.
B
Fig. 14.3 14.5 Hole is
(a) an anti-particle of electron.
(b) a vacancy created when an electron leaves a covalent bond.
(c) absence of free electrons.
(d) an artifically created particle.
14.6 The output of the given circuit in Fig. 14.4.
(a) would be zero at all times.
(b) would be like a half wave rectifier with positive
cycles in output.
(c) would be like a half wave rectifier with negative
vm sin t ~ cycles in output.
(d) would be like that of a full wave rectifier.
Fig. 14.4
88
21/04/2018
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Hkane. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.30. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80189 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now